Casting Pandora from Chromecast Audio

Anyone here had any luck using Pandora with Chromecast audio? I have both Chromecast and Pandora apps (Patched using GMAPS patcher - thanks Cobalt) on my OG Passport.
Chromecast app detects the device, and lists Pandora as a supported app. But, when I select Pandora from the list and go to the actual app, there is no cast button on Pandora

In my case, it still detects the device, and I'm even able to stop casting Pandora when is cast from my iPad or Android device.
The problem I'm facing is that I could not start to cast as the cast option is not available in Pandora.